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Worked Example: Structural Overlay Parameters in a Tunnel Model

Construction of a decision support groundwater model requires that parameters be adjustable, stochastic and representative of geological conditions. This can be difficult to achieve in complex hydrogeological environments where controls on hydraulic properties are both geological and structural in origin.
This worked example report demonstrates use of the PLPROC parameter preprocessor in construction of a stochastic model parameterisation scheme for a complex, multi-layer model that was built to explore inflow to a tunnel during its construction, together with inflow-induced regional drawdown. Hydraulic properties that reflect the presence of near-vertical structural features are superimposed on those that arise from near-horizontal sedimentary layering. All aspects of the parameterisation scheme are scripted. This facilitates history-matching and uncertainty quantification using the PESTPP-IES ensemble smoother.